customer is running openldap server on SLES 9 SP 3 x864, and now willing to move on 11 SP 3. whats the recommended method here.

I am considering to export ldap accounts in ldif format from SLE 9 SP 3, and then import them into the new 11 SP 3 box. the only confusion here is that what would be the password for all those accounts/users on openldap running on SLE 11 SP 3.

Please suggest what would be the best approach here(else IDM ;-) )